#physics

• Auxotonie — A physiological phenomenon or process consisting of a muscular contraction during which the internal tension of the fibers progressively increases concurrently with the shortening of their length; a mechanical activity regimen characteristic of the myocardium during the blood ejection phase or skeletal muscles overcoming a variable elastic resistance.
• Audible — Capable of being heard; whose mechanical vibrations fall within the limits of frequency (usually between 20 and 20,000 Hertz) and intensity perceptible by the human auditory organ; audible, perceptible.
• Audibility — The quality, property, or state of being audible; the degree or level of clarity and intensity with which a sound, voice, or acoustic signal is transmitted and can be distinctly perceived by a receiver in a given environment.
• Avempace — A lowercase spelling variant used in philosophical or historical texts to refer to the school of thought, commentaries, and scientific theories developed by the Andalusian philosopher Avempace; it represents the adaptation of his name as an epistemic common noun to denote a type of mystical rationalism or the physical model of motion that anticipated the modern concept of inertia. Its meaning oscillates between the author's own identity and his conceptual legacy in medieval Islamic and European philosophy.
• Aventurine — A microcrystalline variety of quartz or feldspar, shiny and opaque, characterized by the presence of tiny inclusions of mica, hematite, or chlorite, which reflect light and produce a glittering effect called aventurescence; additionally, the term denotes a special artificial glass invented in Murano containing microscopic crystals of metallic copper. As an adjective, it describes a texture, a reddish-brown color, or an object presenting glittering metallic reflections similar to this mineral.
• Momentum — Archaic spelling or according to orthographic norms prior to 1993 for the noun 'avânt'; a rapid, vigorous, and impetuous movement through which a body increases its speed or gathers momentum to perform a jump or structural displacement; (metaphorically) a state of powerful enthusiasm, passion, creative drive, spiritual energy, or intense progress manifested in a field of activity.
• Avogadro — The surname of the celebrated Italian physicist and chemist Amedeo Avogadro (1776–1856), globally recognized for his fundamental contributions to the development of molecular theory. In exact sciences, his name is directly associated with 'Avogadro's number' and 'Avogadro's law', essential constants and structural principles defining the proportions between gas volume and the number of molecules contained at a given pressure and temperature.
• The axis — The definite articulated form or base variant of the feminine noun 'axă'. It represents that real or imaginary straight line passing through the center of a body, geometric figure, coordinate system, or mechanism, serving as a reference for symmetry, rotation, structural balance, or spatial orientation.
• Axial — Pertaining to an axis, regarding an axis, or located along an axis of symmetry or rotation. In mechanics and engineering, it describes a force, stress, or structural component acting directionally along the centerline of a system, while in anatomy it refers to skeletal or organic elements arranged centrally around the longitudinal axis of the body.
• Azimuth — The horizontal angle measured clockwise (from 0° to 360°) between the North direction of a reference meridian and the direction toward a given point on the Earth's surface or the projection of a celestial body on the horizon.
• Azimuthal — Pertaining to azimuth, belonging to azimuth, or carried out within the horizontal plane of the azimuth; often used to describe telescope mounts, map projections, or measuring instruments that utilize horizontal coordinates based on the angle formed with the North direction.
• Azion — A hypothetical elementary particle or quasiparticle proposed in advanced theoretical physics models to explain phenomena related to quantum asymmetry or gauge field interactions; a structural entity associated with the quantum torsion states of spacetime.
• Baade — A proper surname of German origin, predominantly associated in scientific contexts with the astronomer Wilhelm Heinrich Walter Baade (1893–1960). His foundational contributions include defining the two distinct stellar populations (Population I and Population II), recalibrating cosmic distances by revising the Cepheid period-luminosity relation, and discovering major asteroids, with his name being given to the lunar crater Baade, asteroid 1501 Baade, and an observational window toward the galactic center.
• Baion — A hypothetical elementary particle or quasiparticle proposed in advanced theoretical solid-state physics and quantum mechanics; in other technical contexts, it represents a cylindrical guiding component used in precision mechanics for quick connections. The term is restricted to scientific literature.